diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_display.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_display.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 1f3552397689..44fcff0343f2 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -4105,6 +4105,43 @@ static void lpt_program_iclkip(struct drm_crtc *crtc) I915_WRITE(PIXCLK_GATE, PIXCLK_GATE_UNGATE); } +int lpt_get_iclkip(struct drm_i915_private *dev_priv) +{ + u32 divsel, phaseinc, auxdiv; + u32 iclk_virtual_root_freq = 172800 * 1000; + u32 iclk_pi_range = 64; + u32 desired_divisor; + u32 temp; + + if ((I915_READ(PIXCLK_GATE) & PIXCLK_GATE_UNGATE) == 0) + return 0; + + mutex_lock(&dev_priv->sb_lock); + + temp = intel_sbi_read(dev_priv, SBI_SSCCTL6, SBI_ICLK); + if (temp & SBI_SSCCTL_DISABLE) { + mutex_unlock(&dev_priv->sb_lock); + return 0; + } + + temp = intel_sbi_read(dev_priv, SBI_SSCDIVINTPHASE6, SBI_ICLK); + divsel = (temp & SBI_SSCDIVINTPHASE_DIVSEL_MASK) >> + SBI_SSCDIVINTPHASE_DIVSEL_SHIFT; + phaseinc = (temp & SBI_SSCDIVINTPHASE_INCVAL_MASK) >> + SBI_SSCDIVINTPHASE_INCVAL_SHIFT; + + temp = intel_sbi_read(dev_priv, SBI_SSCAUXDIV6, SBI_ICLK); + auxdiv = (temp & SBI_SSCAUXDIV_FINALDIV2SEL_MASK) >> + SBI_SSCAUXDIV_FINALDIV2SEL_SHIFT; + + mutex_unlock(&dev_priv->sb_lock); + + desired_divisor = (divsel + 2) * iclk_pi_range + phaseinc; + + return DIV_ROUND_CLOSEST(iclk_virtual_root_freq, + desired_divisor << auxdiv); +} + static void ironlake_pch_transcoder_set_timings(struct intel_crtc *crtc, enum pipe pch_transcoder) { |